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  Richtek Technology Electronic Components Datasheet  

RT8209A Datasheet

Single Synchronous Buck Controller

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®
RT8209A/B/C
Single Synchronous Buck Controller
General Description
The RT8209A/B/C PWM controller provides high efficiency,
excellent transient response, and high DC output accuracy
needed for stepping down high voltage batteries to
generate low voltage CPU core, I/O, and chipset RAM
supplies in notebook computers.
The constant-on-time PWM control scheme handles wide
input/output voltage ratios with ease and provides 100ns
instant-onresponse to load transients while maintaining
a relatively constant switching frequency.
The RT8209A/B/C achieves high efficiency at a reduced
cost by eliminating the current-sense resistor found in
traditional current mode PWMs. Efficiency is further
enhanced by its ability to drive very large synchronous
rectifier MOSFETs. The buck conversion allows this device
to directly step down high voltage batteries for the highest
possible efficiency. The RT8209A/B/C is intended for CPU
core, chipset, DRAM, or other low voltage supplies as
low as 0.75V. The RT8209A is in a WQFN-16L 3x3
package, the RT8209B is in a WQFN-14L 3.5x3.5 package
and the RT8209C is available in a TSSOP-14 package.
Ordering Information
RT8209
Package Type
QW : WQFN-16L 3x3 (W-Type)
QW : WQFN-14L 3.5x3.5 (W-Type)
C : TSSOP-14
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Note :
A : WQFN-16L 3x3
B : WQFN-14L 3.5x3.5
C : TSSOP-14
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z Ultra-High Efficiency
z Resistor Programmable Current Limit by Low Side
RDS(ON) Sense (Lossless Limit)
z Quick Load Step Response within 100ns
z 1% VFB Accuracy over Line and Load
z 4.5V to 26V Battery Input Range
z Resistor Programmable Frequency
z Integrated Bootstrap Switch
z Integrated Negative Current Limiter
z Over/Under Voltage Protection
z 4 Steps Current Limit During Soft-Start
z Power Good Indicator
z RoHS Compliant and Halogen Free
Applications
z Notebook Computers
z System Power Supplies
z I/O Supplies
Marking Information
RT8209AGQW
FH= : Product Code
FH=YM
DNN
YMDNN : Date Code
RT8209AZQW
FH YM
DNN
FH : Product Code
YMDNN : Date Code
RT8209BGQW
A0=YM
DNN
A0= : Product Code
YMDNN : Date Code
RT8209CGC
RT8209C
GCYMDNN
RT8209CGC : Product Code
YMDNN : Date Code
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8209A/B/C-07 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8209A Datasheet

Single Synchronous Buck Controller

No Preview Available !

RT8209A/B/C
Pin Configurations
(TOP VIEW)
16 15 14 13
VOUT
VDD
FB
PGOOD
1
2
3
4
NC
17
12 UGATE
11 PHASE
10 CS
9 VDDP
5 678
TON
VOUT
VDD
FB
PGOOD
2
3
4
5
6
1 14
13 UGATE
12 PHASE
NC 11 CS
15 10 VDDP
9 LGATE
78
EN/DEM
TON
VOUT
VDD
FB
PGOOD
GND
2
3
4
5
6
7
14 BOOT
13 UGATE
12 PHASE
11 CS
10 VDDP
9 LGATE
8 PGND
RT8209A (WQFN-16L 3x3)
RT8209B (WQFN-14L 3.5x3.5)
RT8209C (TSSOP-14)
Typical Application Circuit
RTON
250k
VDDP
PGOOD
R2
100k
R1
10
C2
1µF
R6
18k
RT8209A/B/C
TON
BOOT
VDDP
UGATE
VDD
PHASE
LGATE
PGOOD
CS
PGND
FB
CCM/DEM
EN/DEM VOUT
GND
VIN
4.5V to 26V
R4
0
R5
0
C3
0.1µF
C4
10µF
Q1
BSC119 L1
N03S 1µH
BSC119N03S Q2 R7*
C7*
VOUT = 1.05V
* : Optional
C5* C6*
R8
12k
C1
220µF
R9
30k
Functional Pin Description
Pin No.
RT8 209 A
R T8209 B/C
Pin Name
Pin Function
1
3
V OU T
Output Voltage Pin. Connect to the output of PWM converter.
VOUT is an input of the PWM controller.
2
4
VDD
Analog supply voltage input for the internal analog integrated
circuit. Bypass to GND with a 1μF ceramic capacitor.
3
5
FB
Feedback Input Pin. Connect FB to a resistor voltage divider
from VOUT to GND to adjust VOUT from 0.75V to 3.3V
4 6 PGOOD
5, 14
17 (Exposed pad)
RT 8209B :
15 (Exposed pad)
NC
Power good signal open-drain output of PWM converter. This
pin will be pulled high when the output voltage is within the
target range.
No internal connection. The exposed pad must be soldered to
a large PCB and connected to GND for maximum power
di ss ip ati on.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8209A/B/C-07 January 2014


Part Number RT8209A
Description Single Synchronous Buck Controller
Maker Richtek
PDF Download

RT8209A Datasheet PDF






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